diff --git a/net/eth.c b/net/eth.c
index f14767b..aed4dd6 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -203,7 +203,7 @@
 	struct eth_device *d;
 	static int index = 0;
 
-	assert(strlen(dev->name) < NAMESIZE);
+	assert(strlen(dev->name) < sizeof(dev->name));
 
 	if (!eth_devices) {
 		eth_current = eth_devices = dev;